Does a light Bulb Obey Ohm’s law? Essay

Does a Light electric- visible radiation bulb Obey Ohms Law? Obtaining Table of Results electromotive force difference 1 flow rate 1 Voltage 2 Current 2 Average Voltage Average Current Average ResistanceAnalysis After conducting my taste and analysing my conducts I hit found that a light bulb does non obey ohms law, it is a non-ohmic conductor.From the interpret obtained from the results it is clearly shown how ohms law doesnt devote to the light bulb. The graph clearly shows that the current is not proportional to the voltage. The graph shows that as the voltage increased the increase in current was reduced. i. e. when the potential drop difference was 4 volts the current increased by 0. 34 amps, when the potential difference was 8 volts the current increased by 0. 22 amps. The results posterior be explained using science. Variables The variables in the experiment Independent variable I altered this variable.Voltage Controlled Variables  Length of wire  Cross ro leal vault of heaven of wire Wire Material  Light Bulb Fair run Controlled Variables For the by-line of a fair test and ideal results, these controlled variable provide be maintained and kept constant for each voltage, as they loafer make the rate of reaction  Length of wire. The longer the wire, the further the electrons bedevil to travel, so the more the resistance. The shorter the wire the slight the electrons go through to travel so the less the resistance  Cross sectional ara of wire.The larger the evade section of a wire, the less struggle for electrons to go past, the lower the resistance. The small the mystify section of a wire, the more struggle for electrons to go past, the great the resistance Wire Material. Different materials conduct electricity in antithetical ways, the get out the conductor, the less the resistance. The worse the conductor, the more resistance.  The a desire light bulb, which had the same watt filament. Ohms law doe s not apply to circuits where there are temperature changes. The variable, temperature, meant that ohms law could not be applied to the light bulb.It is the light bulb itself that emits the combust. Its source is the tungsten filament, as when electrons try to brighten through the tungsten filament they collide with the tungsten atoms which induce heat and increase the atoms vibration, which leads to further collisions and leads to more light heat and of course resistance. The result supports my Hypothesis. Evaluation I believe the investigation was masteryful as the results produced book with scientific knowledge. In the Ohms Law coursework I investigated whether or not a light bulb obeyed ohms law.In the experiment we increasingly increased the potential difference to see how it affected the current silky through a light bulb. The experiment was carried out accurately in many ways. both variables, other that voltage, the supreme variable and temperature, were kept at a cons tant. The results were handled with accuracy. The results were plotted on a graph. A line of beat out fit was put on each result which meant the results are genuinely accurate, rather than being rounded. The method in which the Ohms Law investigation was carried out is fitting enough to support a firm conclusion, this is becauseAll variable, which effect resistance, were controlled and maintained. With the exception of, voltage, the independent variable and temperature, all were kept constant. For the interest of a fair test and accurate results, these controlled variable will be maintained and kept constant for each voltage, as they put up affect the rate of reaction  Length of wire. The longer the wire, the further the electrons have to travel, so the more the resistance. The shorter the wire the less the electrons have to travel so the less the resistance Cross sectional area of wire.The larger the cross section of a wire, the less struggle for electrons to go past, the l ower the resistance. The smaller the cross section of a wire, the more struggle for electrons to go past, the greater the resistance  Wire Material. Different materials conduct electricity in different ways, the better the conductor, the less the resistance. The worse the conductor, the more resistance.  The same light bulb, which had the same tungsten filament. Voltage was supplied with an accurate variable d. c. supply. Current was measured using an accurate ammeter and voltage was measured with an accurate voltmeter.For further accuracy I conducted the experiment twice so I could work out the average. Both times the results were expected and were very similar. Therefore I believe that this investigation has sufficient evidence to support a conclusion that a bulb does not obey ohms law. A bulb is a non ohmic conductor. If I were to plagiarize the investigation I would improve it by  Using other conductors like lasers. do the length of the wire into a an independent variable  make the cross section area of the wire into an independent variable Made the material of the wire into an independent variable.Made the type of bulb into an independent variable Although I believe my investigation to be a success I believe if I were to make the improvements I said, I would have reliable results with an even stronger conclusion as a wider range of instruction would have been taken into account Ohms Law 1 Stepney grand School 10548 Show preview only The above preview is unformatted school text This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section. Download this quiz Print Save Not the one?